Physics of the Solid State

, Volume 54, Issue 4, pp 790–797

Resistance to dynamic deformation and fracture of tantalum with different grain and defect structures

  • S. V. Razorenov
  • G. I. Kanel’
  • G. V. Garkushin
  • O. N. Ignatova
Mechanical Properties, Physics of Strength, and Plasticity

DOI: 10.1134/S1063783412040233

Cite this article as:
Razorenov, S.V., Kanel’, G.I., Garkushin, G.V. et al. Phys. Solid State (2012) 54: 790. doi:10.1134/S1063783412040233
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Abstract

This paper presents the results of measurements of the strength properties of technically pure tantalum under shock wave loading. It has been found that a decrease in the grain size under severe plastic deformation leads to an increase in the hardness of the material by approximately 25%, but the experimentally measured values of the dynamic yield stress for the fine-grained material prove to be less than those of the initial coarse-grained specimens. This effect has been explained by a higher rate of stress relaxation in the fine-grained material. The hardening of tantalum under shock wave loading at a pressure in the range 40–100 GPa leads to a further increase in the rate of stress relaxation, a decrease in the dynamic yield stress, and the disappearance of the difference between its values for the coarse-grained and fine-grained materials. The spall strength of tantalum increases by approximately 5% with a decrease in the grain size and remains unchanged after the shock wave loading. The maximum fracture stresses are observed in tantalum single crystals.

Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • S. V. Razorenov
    • 1
  • G. I. Kanel’
    • 2
  • G. V. Garkushin
    • 1
  • O. N. Ignatova
    • 3
  1. 1.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovka, Moscow regionRussia
  2. 2.Joint Institute for High TemperaturesRussian Academy of SciencesMoscowRussia
  3. 3.Russian Federal Nuclear Center—The All-Russia Research Institute of Experimental PhysicsSarov, Nizhni Novgorod regionRussia